Anhydrous proton-conducting polymeric electrolytes for fuel cells

The Journal of Physical Chemistry. B
S R NarayananS G Greenbaum

Abstract

The need to design proton-conducting electrolytes for fuel cells operating at temperatures of 120 degrees C and above has prompted the investigation of various "water-free" polymeric materials. The present study investigates the properties of "water-free" proton-conducting membranes prepared from high-molecular-weight polymeric organic amine salts. Specifically, the properties of bisulfates and dihydrogenphosphates of poly-2-vinylpyridine (P2VP), poly-4-vinylpyridine (P4VP), and polyvinylimidazoline (PVI) have been investigated over the temperature range of 25-180 degrees C. Nanocomposites of these polymeric organic amine salts and hydroxylated silica have also been investigated in this study. These polymers are found to be stable and proton-conducting at temperatures up to 200 degrees C. In all the polymer examples studied herein, the phosphates are more conducting than the bisulfates. The activation energy for ionic conduction was found to decrease with increasing temperature, and this is associated with the increased polymer mobility and ionization of the proton. This is confirmed by the high degree of motional narrowing that is observed in proton NMR experiments. The measured values of conductivity and the differences in pK...Continue Reading

References

Apr 20, 2001·Nature·S M HaileR B Merle

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Citations

Apr 16, 2011·The Journal of Physical Chemistry. a·Xiaohu Li, Srinivasan S Iyengar
Sep 16, 2016·The Journal of Physical Chemistry. B·Qinfang SunScott M Auerbach
Jun 30, 2018·Angewandte Chemie·Himadri Sekhar SasmalRahul Banerjee
Apr 2, 2009·The Journal of Physical Chemistry. a·Martin SalaToshihiro Fujii
Sep 5, 2008·Environmental Science & Technology·Ho Il ParkMinhee Yun
Oct 12, 2011·The Journal of Physical Chemistry. B·Zuofeng ZhaoC Austen Angell

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